How to get a localized value?

Try this

var productAttributeValue = _productAttributeService.GetProductAttributeValueById(attributeValueId);

var name = productAttributeValue.GetLocalized(x => x.Name, _workContext.WorkingLanguage.Id, false, false);

Try this

var productAttributeValue = _productAttributeService.GetProductAttributeValueById(attributeValueId);

var name = productAttributeValue.GetLocalized(x => x.Name, _workContext.WorkingLanguage.Id, false, false);

I have three languages. This feature works well for English and Spanish. For the Russian language is an empty value. How can I check why?

I have three languages. This feature works well for English and Spanish. For the Russian language is an empty value. How can I check why?
Can you check resource string value for Russian language.

For check this, Go to Admin >> Configuration >> Languages >> Edit Russian language >> Search by your resource string or add new value. if you adding it will update exist one.